unsafe fn modify_by_address(address: usize) { // TODO: Fill your safety notice of the code block below to match your // code's behavior and the contract of this function. You may use the @@ -35,16 +36,15 @@ unsafe fn modify_by_address(address: usize) { } } #[cfg(test)...
//HashMap查找key,没有的话自动添加, //or_insert(1);空的初始赋值1 //and_modify(|counter| *counter += 1)有的值+1 fn main() { use std::collections::HashMap; let mut letters = HashMap::new(); for ch in "a short treatise on fungi".chars() { letters.entry(ch).and_modify(|cou...
目前我们代码都是基于内存安全的,并且会在编译阶段进行限制报错不安全代码。 不过rust还内置隐藏了一个(second language)第二语言,它不会强制要求内存安全。 它就是unsafe Rust, 写法和安全的差别不大,但是可以让我们使用额外的”超能力(superpowers)“。
// pointer. Normally you'd be given some address like // `0xDEADBEEF` over which you'd instantiate a `Regs`. addr: &mut x as *mut [u32; 33] as usize, }; let input = regs.rx.get_field(UartRX::Data::Field::Read).unwrap(); regs.tx.modify(UartTX::Data::Field::new(input)...
* Modify `Interior Mutability` to use Mutex instead of Cell/RefCell, as noted in the comment in that file. * Replace the health-statistics exercise, which really has little to do with borowing. Maybe something that tempts students to use &mut self at the same time as an exclusive referenc...
24.04 desktop machine. They have been tested on a fresh install of Ubuntu 24.04 LTS. They contain all the software that is needed for Rust development, OBS Studio use, and general developer productivity. They are highly opinionated for my use case, but you can modify them to suit your ...
let lock = Mutex::new(41); // Create a mutex that stores the data insidelet guard = lock.lock().unwrap(); // Acquire guard*guard += 1; // Modify the data using the guard 这与主流语言(包括 Python)中常见的互斥锁 API 完全不同——在主流语言中,互斥锁和受其保护的数据是分开的,因此...
macro and modify the print! macro to use our static WRITER instead of _print: // in src/vga_buffer.rs macro_rules! print { ($($arg:tt)*) => ({ use core::fmt::Write; let mut writer = $crate::vga_buffer::WRITER.lock(); writer.write_fmt(format_args!($($arg)*)).unwrap()...
Learn how to host a Rust server: 1. Set up your VPS 2. Install the Rust server 3. Modify server settings 4. Launch the Rust server + more.
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